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Geometry
Unit 3: Geometry
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Terms in this set (51)
Quadrilateral
4 sided figure
Polygon
Closed figure with only straight lines
Triangle
3 sided figure
Pentagon
5 sided figure
Hexagon
6 sided figure
Heptagon
7 sided figure
Octagon
8 sided figure
Nonagon
9 sided figure
Decagon
10 sided figure
Right Triangle
Triangle with a 90 degree angle
Acute Triangle
Triangle with 3 angles less than 90 degrees
Obtuse Triangle
Triangle with an angle greater than 90 degrees
Scalene Triangle
Triangle with no congruent sides
Isosceles Triangle
Triangle with 2 congruent sides
Equilateral Triangle
Triangle with 3 congruent sides
Congruent
Equal
Parallelogram
A quadrilateral whose opposite sides are parallel and congruent
Trapezoid
A quadrilateral with 1 pair of parallel sides
Rectangle
A parallelogram with 4 right angles
Square
A rectangle with 4 congruent sides and 4 right angles
Rhombus
A parallelogram with 4 congruent sides
Acute Angle
An angle that has a measure less than 90 degrees
Angle
A shape formed by two line segments or rays that share the same endpoint
Closed Figure
A figure that begins and ends at the same point
Coordinate Grid
A grid formed by a horizontal line called the x-axis and a vertical line called the y-axis
Endpoint
The point at either end of a line segment or the starting point of a ray
Horizontal
Extending left and right
Interval
The difference between one number and the next on the scale of a graph
Line
A straight path in a plane, extending in both directions with no endpoints
Line Segment
A part of a line that includes two points called endpoints and all the points between them
Obtuse Angle
An angle whose measure is greater than 90 degrees and less than 180 degrees
Open Figure
A figure that does not begin and end at the same point
Ordered Pairs
A pair of numbers used to locate a point on a grid
Origin
The point where the two axes of a coordinate plane intersect (0,0)
Parallel Lines
Lines in the same plane that never intersect and are always the same distance apart
Perpendicular Lines
Two lines that intersect to form four right angles
Plane
A flat surface that extends without end in all directions
Point
An exact location in space
Regular Polygon
A polygon with congruent sides and angles
Irregular Polygon
A polygon without congruent sides and angles
Ray
A part of a line; has an endpoint on one end and continues forever in the opposite direction
Right Angle
An angle that forms a square corner and measures 90 degrees
Scale
A series of numbers placed at fixed distances on a graph to help label the graph
Straight Angle
An angle whose measure is 180 degrees
Two-Dimensional Figure
A figure that lies in a plane
Vertex (Vertices)
The point where two or more rays meet
Vertical
Extending up and down
X-Axis
The horizontal number line on a coordinate plane
X-Coordinate
The first number in an ordered pair
Y-Axis
The vertical number line on a coordinate plane
Y-Coordinate
The second number in an ordered pair
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